Shock absorber



Patented Au -.-22, 1944 a i 2 4 'QNITED ESTATE-s P T T O I is closed atone end by the end plug 2, through that e shock-absorber y be Ope ted nten- 4 for the attachment'bf one end of t shock- 25 carried at or nearone end of the lever, whereas between the wall of the cylinder l and thehol- 5 the end thereofrwhich is e o tm sphere,

by the face 9a of the plunger head 9. The space plunger movem t. ductmeans co at n v I 2 is thus of variable volume, depending upon 40between d annu ar Space and the interlorof other direction of travel.The plunger further 3. A telescopic shock-absorber as 'set forth in gsnocnunsomsnn Rowland'Henry Bound, Cheltenham, England, assignor toyDowtyEquipment Limited, Cheltenham, England Application'october 16, 1941,Serial No. 415,319

5 In Great Britain October 16, 1940 p p 'sclcims. ((1267-64) g t Thisinvention is a telescopic shock-absorber l8 against the pressure ofg'asentrapped in thewhich operates intension to compress resilient inflationchamber 20 between the idle piston means entrapped between the plungerand cyland the outer end of the plunger; Gas atpresinder. 1 I v sure isintroduced into the chamb r. 20 through I -It is an objector-the'inven'tion'to provide a 5 the inflation valve 2|. I l satisfactory,simple and convenient form of tele- A fiexible sleeve-likecorrugateddiaphragmor scopic shock-absorber to operate in tension. boot22 is provided over the mouth .of the cylin- It. is a further objecto'fthe invention to proder to prevent mud and dust being deposited on videasimple-and particularly compact 'shockthe plunger. r absorber foremployment in aircraft alighting l0 Anyjconvenient form of .joint may.be provided gear. on the outer .end'of the plunger for the attach-Yet-afurther obiect o'f the invention is the m m there f o he s ructurein which the provision of a shock-absorber in which the shock-absorberis to p e, u n t e d aw n glanding arrangements are particularly simpliea thgeadedsocket has been Shown, as indicated fled. at 2 7 The inventionwill now be described with ref- In airoraft-alighting gear, f wh ch t aye erence to th accompanying diagrammatic stated that the shock-absorberaccording to the drawing, which is a side elevation in section presentinvention n par u ar yd v s d. illustrating a shock-absorber inaccordance. with the shock-absorber pe s between a lever and theinvention. a leg or equivalent fixed structure, which lever In thedrawing, th sh0ck-ab5orber cylinder in turn mounts the landing element.In order which the port 3 xt t atmosphere. e sion, the lever extends oneach side of a-pivotal plug 2 is further pr vid d with an apertured lugmounting on the leg, the landing element being absorber t th tr t r i wi h t t (metthe shock-absorber operates between the leg and ate. At itsend remote from t closure plug 2 an extension of the lever on the sideof the pivot the shock-absorber is glanded to receive slidably remotefrom t o s' the hollow plunger 5. The glanding is in this What I 91mm 3case provided by the resilient rings 6 and 1 A telesooplo shook-absorberincluding a which are located in the reduced neck part a of chamber opento mo p e at one end. a holthe cylinder. Internally of the cylinder Ithe low plun e ng a head slidably fitting the p unger 5 has a head 9,also provided with pack- Chamber, Packing nd about the Plunger ing ringsl0 and II, and th r is th defined sealing'the'mouth of the chamberremote from low plunger 5 an annular space I: bounded the plunger andchamber cooperating t0 define longitudinally by the face So of thereduced neck an annular space between t e a d and the portion 8 at theouter end and at the inner end plunger head va i volumetrically i h theposition of the face So in relation to the face said plunger t r u apoint thereof b tween the 8a. The inner end of the hollow plunger 5 ishead and the gland, fluid filling said annular closed by the end plugIS. The space I2 is in space and entering said plunger through saidcommunication with the interior of the hollow duct means againstresilience'resisting extension plunger 5 through ports l4, l5 and IS.The ref of said plunger relative to said chamber.

erence numeral l1 indicates generally a clack 2. A telescopicshock-absorber as set forth in valve which may be of any usualconstruction 7 claim 1, including damping means constituted by chosen toopen when the plunger travels in one flow resistance passage meansdisposed between direction to increase the port area available for theouter end of the plunger and the inlet of the fluid flow over and abovethat provided in the duct means to the interior thereof.

includes an idle piston I 8. claim 1, including damping'meansconstituted by Liquid is introduced into the space I2 through flowresistance passage means disposed between a filler plug l9, and inoperation of the device the outer end of the plunger and the inlet ofthe liquid from the space l2 displaces the idle piston duct means to theinterior thereof, the damping means including a clack valve operating tomove artially and vary the flow resistance passage ;nreans in accordancewith the direction of plunger travel whereby to provide a differentialdamping effect; I

4. Atelescopic shock absorber operating in tension, comprising acylinder and a hollow plunger ,slidably received within the cylinder todefine an annular chamber, a gland at the mouth of the cylindercooperating with the plunger, an imperforate head closing the inner endof the plunger and engaging the cylinder to separate suchan-v nularchamber and the interior of said hollow plunger from the portion of saidcylinder-at'the opposite side of said head said plunger having" a port,adjacent said head, aifording communication between the annular chamberancl the interior of said plunger, for displacement of liquid from theannular chamber, upon approach of said head and gland, and meansresiliently resisting such flow of liquid from the annular chamber intosaid plunj'ger during approach of said head and s n j v '5. A'telescopic shock absorber as in claim 4, wherein' thehollow plungerisclosed at the end opposite the head to define a trapped air spacespace adjacent to the plunger head and an air space remote therefrom,

'7. A telescopic shock absorber as in clairn'4, including meansrestricting return flow of liquid from within the plunger back to theannular chamber between the plunger and cylinder.

8. A telescopic shock absorber operating in tension, comprising tworelatively reciprocable tubes, one tube being received'telescopicallywithin the other, and means defining with said tubes twointercommunicating chambers, one being liquidfilledand decreased involume by relative extension movement of said tubes tov displace liquidtherefrom into the other chamber, and such other chamber defining aliquid-containing portion, in-

creased correspondingly in volume by flow of liquid thereinto from saidliquid-filled chamber as its volume is decreased by relative extensionwithin the, plunger, and flow of liquid into the hollow plunger isresiliently. resisted by compres: sion of the'air in such air space.

A telescopic shock absorber as in' claim 4, including "a pistonsli'dable within the hollow plunger, and dividing its interior into aliquid ROWLAND. HENRY. Boom)

